Isalpha Function in C
The isalpha() is a library function in the C language for checks whether your entered string is an alphabet or not. Let’s learn Isalpha Function in C through a Program.
Use of isalpha in C
#include <stdio.h>
#include <ctype.h>
int ft_str_is_alpha(char *str)
{
int index = 0;
int result = 0;
while(str[index] != '\0')
{
if(isalpha(str[index])!=0)
{
result = 1;
}
else
{
result = 0;
break;
}
index++;
}
// printf("\nr: %d", result);
return(result);
}
int main()
{
char c[] = "helloWaaa";
printf("%d\n",ft_str_is_alpha(c));
printf("%s",c);
}
Replicate isalpha in C
#include <stdio.h>
#include <ctype.h>
int ft_str_is_alpha(char *str)
{
int index = 0;
int result = 0;
while(str[index] != ‘\0′)
{
if((str[index]>=’a’ && str[index] <=’z’) || (str[index]>=’A’ && str[index] <=’Z’) )
{
result = 1;
}
else
{
result = 0; break;
}
index++;
} // printf(“\nr: %d”, result);
return(result);
}
int main()
qk[o
{
char c[] = “hello1Waaa”;
printf(“%d\n”,ft_str_is_alpha(c));
printf(“%s”,c);
}
Isalpha in C
helloWaaa
The moment you encounter a character other than the alphabet, like else part of ur condition, then you set
result =0;
and immediately break; the loop, and in the end when you return the result it will have 0.
if ur condition is always true like it has all alphabet,
then it will set result=1; and in the end, u will return result=1;
C isalpha
I hope you will understand about isalpha in C.
